Polishing-wheel.



II'. F. IvIcGovEIIII.v

POLISHING WHEEL.

APPLICATION FILED Nov.2. I9I8.

PatentedMzIr. 11, 1919. Eig; l,

, q. @QJ Il Y l 11| DANIEL REDRICK MCGOVERN, OF MONTPELIER, VERMONT.

POLISHING-WHEEL.

Application filed November 26, i918.

l To all whom 'it may concern.'

Be it known that I. DANIEL F. McGov- ERN, a citizen .of the United States, residing at lvlontpelier, county ot' Washington, State of Vermont. have invented certain new and useful Improvements in Polishing- Wheels. of which the following is a specification, This invention relates to polishin wheels, and` particularly to a polishing or ironing wheel having scroll-shaped ilanges between Whichabrasive is introduced and by which it is worked against the surface, usually granite, marble or other stone being polished.

In polishing stone, the process usually followed is to rst point and build up the rough stone, after which the stone is smoothed or dressed, and is rea-dy for the bu'ling or finishing step. For the firstI step an abrasive consisting of hard chilled-iron pellets or shot mixed with sand and wet with -water is usually employed; for the second, the abrasive is usually comminuted carbolon, eme-ry powder .or similar finely divided substance; while for the third, a reversi-ble felt buii'er is used.

My polishing wheel is particularly intended for use in carrying out. the first step of the usual polishing process, as distinguished from the second, and involves certain characteristic differences, owing to the difference in 'the abrasive material used in these steps.

The tendency of the heavy abrasive used in the roughing step is to clog the channels separating the flanges of the scroll, thus ca'using an unequal. distribution of the abrasive, with resultant loss in efficiency. Moreover, the tendency of the abrasive is 'to' be thrown from under the wheel by the centrifugal torce developed as the wheel rapidly rotates, obstructs the even and progressive feed of the abrasive' toward the center of the wheel. Certain difficulties are also experienced in securing a proper feedingin of the abrasiv in preventing it from spilling out, and in securing a free 'workin of the material between the flanges.

he object of my invention, generally stated, is to provide a polishing wheel in ywhich the foregoing difficulties are evercome. This object, and certain other features of advantage which will appear more .particularly hereinafter, are secured in the Specification of Letters Patent.

Patenten Mar. 11, 1919.

Serial No. 264,230.

polishing wheel of the present invention. The construction and operation of my invention is disclosed in the following specitication, and illustrated in the accompanying drawings, throughout which like reference characters are correspondingly employed.

ln the drawings:

Figure l is a bottom view of a polishing wheel in accordance with my invention, and

Fig. 2 is a side view thereof.

The polishing wheel selected as an illustrative embodiment of'iny invention has a. lateral intake for the abrasive, as distinguished from those wheels in which the abrasive is fed in at the top of the wheel.

l have indicated at 1 a plate or disk forming the frame or body of the polishing wheel and having a central mud-discharge open-` ing 2 and lugs 3 to receive the driving shaft. 7`5

My invention consists in the construction and arrangement of the flanges between which the abrasive works.

According to the present invention, as illustrated herein, the flanges are disposed as double scrolls of progressively increasing length from the center outward and extend- 'ing circularly about the wheel, as designated by the reference' characters 4, 5, 6, 7 and 8 and 4i-1, 51, 61, 71, and 81, respectively.

Each ange is of substantially segmental form, and is preferably sharpened at its forward end, as .indicated at a, to provide a runner. The curvature is such that the respective ends of corresponding'ianges are positioned at substantially the same distance from the center of the wheel, and with the exception of flanges 5 and', the forward ends all terminating in substantially the same plane, indicated P, Fig. l. The rear ends of flanges 4 and l1 are extended somewhat and overlap the adjacent forward ends of anges 6 and 61, providing chokers 40 and 401 overlapping the lateral intake openings for the abrasive and adapted to prevent the abrasive from spilling from the channels, without however impeding free intake of the abrasive. `The forward ends of the flanges 5 and 51 terminateshort of the indicated plane P and are positioned closer to the lianges 4.- and 41, so that the intake channels for the abrasive are relatively narrow at the periphery of the disk and progressively increase in width `as .they approach the center. This arrangement also scroll-shaped f vdistributes the balance of the wheel some- 51, 6, 61, 7 71, and 8, 81, do not overlap each y other, no obstruction is offered to the free working of the abrasive between the flanges.

Various modifications in the form and construction of my device may obviously be made, all without departing from the spirit of my invention, if within the limits ofthe appended claims. v

What I therefore claim and desire to secure by Letters Patent is:

l. A polishing wheel comprising a plate having on its working face duplicate sets of symmetrically arranged segmental flanges disposed on opposite sides of a plane passing transversely across the plate, the rear end of `the'cutermost flange of each set extending beyond said plane and overlapngi-thefforward end of the next inner ilengewf the oppositeset and constituting a choker effective to prevent the abrasive spilling out. j

2. A polishing Wheel com rising a plate having on vits working Face dupllcate sets of symmetrically arranged segmental.

flanges disposed on opposite sides of a plane passing transversely across the plate, the rear end of the outermost flange yof each set extending beyond saidplane and overlapping the forward 'end of the next inner flange of the opposite set and constituting a chokereifective to prevent the abrasive spilling out, and the forward end of that flange of each set of flanges which lies between the'said lnext inner ange and the saidchoker flange of its set vterminating short of the said plane and providing with the forward ends of the choker flanges relatively staggered abrasive intake openings at opposite edges of the plate.

In testimony` whereof I affix my signature in presence of two witnesses. A

p DANIEL FREDRICK MCGOVERN.

Witnesses:

HARRY C. SHURTLEFF, R. H. NEWTON. 

